% 文档类(模板)
\documentclass{ctexart}
% 导言区

\usepackage{csquotes}

% 正文区(有且只能有一个)
\begin{document}
Hello \LaTeX.

{\centering The small  {\bfseries bold Romans ruled}}


\Large \enquote{all of \enquote{great} big great big Italy}.
all of {\itshape Italy}.

NWAFU---Overleaf

\end{document}
